【High Quality Material】The slide rails are made of thickened cold-rolled steel, which is durable. It will keep your drawers stable and safe even carrying up to 80KG heavy weight items. 【Long Year Service Life】The frame heavy duty drawer slides have been tested by professional testing institutions. The number of opening and closing of the drawer slide exceeds 100,000+. 【Full Extension Drawer Slides】The length when fully expanded is more than twice that when closed, making it easier to use and install.Using double rows of high-quality solid steel balls, smooth push and pull, quiet and comfortable. 【Installation Suggestion】Close length: 385-535mm. Maximum load: 80kg. Reserved installation clearance: single track 45mm, upper track + lower track 91mm. 【Application Range】These slides are compatible with most major drawer and cabinet types. Use on bedroom furniture, sliding cabinet doors, office cabinets, and bathroom cabinets.